Method of placing liners in sleeves for deep-well oil pumps



I 1,792,941 METHOD 0F PLACING LINERS 1N sLEEvEs FOR' DEEBWFLLv IL PUMPS Feb; 17, 1931.

E. E. sTEvENsoN Fiied Aug. 27, 1928 Trae/Vey.

Patented Feb. 17, 193i ENT OFFICE EDWARD E. STEVENSON, OF LOS ANGELES, CALIFORNIA, .IASSIGNOR TO4 EMSCO DERRICK EQUIPMENT COMPANY, OF LOS'ANGELFS, CALIFORNIA, A CORPORATION OF CALI- FORNIA METHOD 0F PLACING LIN ERS IN SLEEVES FOR DEEP-WELL OIL PUMPS Application led August-27, 1928. Serial No. 302,230.

-My invention relates to oil well pumps, and particularly to a novel and improved pump barrel and method of. assembling same.

In the oil producing industry, the oil is lifted to the surface of the ground by means of an oil well pump which consists of a barrel attached to the lower end .of the pump tubing, and a pump plunger adapted to ber reciprocated in the pump barrel by means of a string of sucker rods extending through the pump tubing and the surface of the ground. At the surface of the ground is a walking beam whereby a reciprocatory motion is imparted to the'string of sucker rods for reciprocating the pump plunger.

rl`he pump barrel ordinarily used consists of a jacket having collars secured to the opposite ends thereof. Inside the jacket is a provide ina plurality ofliners which are accuratelyA machined to form a -true internal cylindrical surface. These liners ordinarily are made in short sections to facilitate true boring and grinding, and are placed in the 'jacket in end contact with each other, and also with their external faces in contact with the internal surface of the jacket.

It is. one of the objects of my invention to provide a' pump barrel consisting of a jacket and linerslsecured in the jacket, the liners'not being in contact with' the jacket. The object ofthis construction is that accurate machining of the exterior ofthe liners and the interior ofthe jacket is eliminated.

A further object of the invention is to provide a pump barrel in which one end of the jacket and one end of an end liner, which is located in the jacket, are provided with'.

centralizing means forholding the linerin centralized position in the jacket, and in which the-liners are clamped together so .that the other ofthe liners are held in centralized position due to their being clamped -betweenen'd liners ofthe pump barrel.

A. further object of the invention is to ump of the character previously describe an assembly of pump liners consisting ofv end and intermediate liners, the

end liners having diametrally enlarged centralizingportions thereon, and a jacket for@ tions of the end liners whereby to centralize -suchend liners within the jacket.

A still further object of the invention is to provide a method of assembling my unique pump barrel. v .4

t Other objects and advantages, ofv the invention will be pointed out in the following description. Referring to the drawing in which a preferre pump barrel and method is illustrate y Fig. l is a vertical section through the pump barrel, embodying the features of the invention. v

Fig. 2 is an enlarged vertical section of one end thereof.

Fig. 3 is a section taken on the line 3 3 of Fig. 2.

Fig. 4 is a sectional view illustrating oneA l 'numeral 11 represents the jacket of the pump barrel. This jacket is ordinarily formed of steel, and is of such character as to have considerable tensile strength, and to withstand considerable strains and jars. As shown best in Fig. 2, the ends of the jacket 11 are provided with internal threads 12. At the inner ends of the'internal threads 12 are centrali'zing recesses 14.' The centralizing recesses 14 are concentric to the axis of the jacket 11, and are accurately machined to'a cylindrical form.

Enclosed by the jacket 11 is a, lurality of intermediate liners 15, and a pair of end liners 16.' In very short barrels there may may be only the two end liners 16. Each of the liners is of such an external diameter' that van annular space 17, which maybe about 133g of an inch, is'v provided between the liners and 'the internal cylindrical face yof the jacket 11. Each liner has an accurately bored bore'18, and these bores are'ali ed'so as to be only one intermediate liner 15, or thereA provide a continuous cylindrical ore in which `-tlieplunger ofthe pump mayv reciprocate.

End faces 19 of each liner 15 and 16 are formed in a plane at ri ht angles to the axis of each liner, .and are eld in contact with each other. l

The outer end of each end liner 16 is provided With a centralizing shoulder 21. The centralizing shoulder 21 of each end liner `16 is provided with an accixrately machined centrica ly on the main axis of the pump jacket 11, as will be described.

Adapted to be 'screwed into the internal threads 12. formed in the opposite ends of the pump jacket 1l are end collars 24. The endcollars 24 are provided with external threads 25, which are advanced into the ends of the pump jacket 11 in contact with the internal threads 12. The inner ends of the collars 24 are provided with accurately `machined end faces 26, which Contact the accurately machined end faces 27 of the end liners 16. When the end collars 24 are secured to the pump jacket 11, as illustrated in the drawing, the intermediate liners 15 and the end liners 16 are rigidly clamped together so that they are relatively immovable. The end collars 24 have openings 28 which connect to the bores 18 of the liners 15 and 16 and in the ends of the openings 28 are internal threads 29 so that the pump barrel may be attached to other parts of the oil pumping equipment.

Referring particularly to Fig. 4, I will now describe the method of assembling the pump barrel of my invention.

I n' the method -of assemb'ling,'the liners 15 and 16 are first assembledon a mandrel indicated by the numeral 35 in Fig. 4. 'This mandrel is preferably of the expanding type, and for this purpose I may use a mandrel similar to the one' patented by Daniels and Burgess on March 21, 1911, Patent No. 987,347. Any other suitable mandrel, however, ma be used. In the drawing the mandrel an arts. are shown in vertical position. Ordinarily the assembling is done with the arts in horizontal position. Fig. 4 is verticall arranged only to conserve space on the rawing. The purpose of placing the liners 15 and 16 on the mandrel 35 is to hold them in true axial alignment during the rocess of assembling.

A of vthe liners are placed on themandrel, with the exception of one of the end liners 16. The assembly of the mandrel and liners is then inserted into the Aump jacket 11 from one end thereof so that t e centraliz- `9 ingshoulder 21 of the end liner carried by the mandrel, rests in the centralizingrecess 14. The other end liner is then placed on the mandrel from the opposite end of the jacket 11. It will be seen that this is necessary in view of the fact that the centralizing shoulder 21 would not permit an end liner to be inserted through the jacket. At this time all of the liners are on the mandrel 35, and the centralizing shoulders 21 of the two end liners 16 are positioned in the centralizing recess 14. The mandrel 35 at this time may be adjusted so that the liners will vbe held in true axial alignment.

The centralizing means, which consists of the centralizing shoulder 21 and the cen tralizing recess 14 holds the end liners 16 concentrically with the jacket"11, and the mandrel 35 holds the intermediate liners 15 in true axial alignment with the end liners 16. Therefore all of the liners are in true axial alignment with the axis of the jacket 11.

The next step in the process is to attach the end collars 24 to the jacket 11. The end collars 24 are screwed tightly against the end faces of the end liners 16 with the result that the intermediate liners and end liners 15 and 16 are rigidly clamped together so that it is -absolutely impossible for them to move relative to each other. The mandrel 35 is'then adjusted so that it may be moved from the liners, this constituting the final step in the assembling pxgocess.

vThe important feature of the invention, as emphasized in the first part of the specification, is that the liners 15 and 16 are spaced from the jacket 11, the end liners being centralized in the jacket 11 by the centralizing means, and the intermediate liners 15 being lcentralized during the assembling of the pump barrel, and being thereafter held in centralized position due to their being clamped between the end liners 16. This design is not only entirely satisfactory in operation, but has certain advantages` over Vthe ordinary pump barrel in which all of the liners are in contact with the jacket.

One advantage is that because of the annu- Llar space 17, the internal face of the jacket 11 and the external faces of the intermediate liners and end liners 15 and 16 do not have to be accurately machined. This conduces to i economy.V

Another advantage of the invention is that in the event that the jacket 11 becomes dented, the dent may be received by the space 17, and will not damage any of the liners in, any manner.

The invention in its broad concept consists of a jacket, liners in the jacket, not in con- 'tact with the jacket, centralizing means at the end ofthe pump barrel, and means for clamping the liners together.

Other features of the invention obviously ,ff reside -in the details of construction of the preferredform of the invention villustrated saidliners'.

- means' for exerting end pressure to 'clamp yherein, but I do not intend to be limited t0 this specific embodiment of the invention.

I claim as my invention:

1. A pump barrel comprising: a jacket having internal threads formed in the ends, and a centralizing recess at the inner ends of said internal threads; an intermediate liner in saidy jacket, said intermediate liner being smaller in external' diameter than the internal diameter of said jacket; end liners in the ends of said jacket, said end liners engaging said intermediate liner and being of smaller external diameter than the internal diameter of4 said jacket; centralizing shoulders formed on said end liners, and rested in 'said centralizing recesses for centralizing said liners; and end collars screwed into said internal threads for clamping said liners together, said collars having inner end faces perpendicular to theaxis of said liners,

. 2. A pumpbarrel comprising: a jacket;

liners in vsaid jacket, there b'eing anannularl space in said jacket around said. liners; cen-v.' tralizinff mean-s operating between the ends of said jacket and the ends of the end liners of said liners, said centralizing means comprisinga centralizing annular face formed in v each endv4 of said 'jacket vand a centralizing face formed on said end vlinersfor engaging- 'said annularjfaces; and separate clamping means exertingpressure against the outer'end faces of said liners, for clamping said 'liners ends of the liners by engagement with annular centralizing faces formed in the ends of the jacket; exertingend pressure to clamp` the liners in the jacket; and removing the having cylindrical enlargements thereon adapted to centralizin g engagement withasaid cylindrical faces of said jacket; and means exerting end pressure against the outer ends of said end liners for clamping said pluralityr of liners together. l

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 18 day of August, 1928.

EDWARD E. STEVENSON.

together, the inner end'faces of said clamping means beingperpendicular to the. axis of 3.-A pump barrel comprising: a jacket; liners in said jacket, there being an annular space in said jacket around said liners; centrali zin means operating between the ends of said j acet andthe ends of the end liners of said liners, said centralizing means comprising a centralizing annular, face formed -in 'each end -of said jacket and a centralizing shoulder` formed on said end liners` for en-V.

gaging said annular faces; and clamping said liners together.

LA pump barrelv comprising: va'jacket; liners insa-id acket, there being an annular space in said Jacket'around said liners; centralizing means operatin between the ends of said j acket' and' the en s of the end liners of said liners, said 'centralizing means com- ]-acket and a eentralizin'g shoulder formed on one of said lm ersvandengaged 1n said cen- ,tralizin'g recess; and clamping means exerting end pressure for clamping said liners toprisingfa centraliz'ing recess formed,i'n said ment; placing .the liners in a jacket so that the walls of the liners and the walls of the jacket are not contact; centralizing tige 

